Accessing class through $variable within another class?

Question

I have a few classes, initiated on index.php, like so:

<?php
require_once('./classes/core.class.php');
require_once('./classes/forum.class.php');
$core = new core();
$forum = new forum();
?>

Is there any way to use $core within $forum? I can do it by using core::functionName() but not by $core->functionName().

The classes are:

<?php
class forum{
    public function functionName(){

I can access it by defining the class again within each function

public function functionName(){
    $core = new core();

Thanks in advance

What do you mean $core within $forum? With the code you provided, $core->functionName() should work just fine. Where does $forum come into play? — Logan Serman
– Logan Serman, Commented Dec 30, 2011 at 13:36
The class example I gave should be forum, rather than core. Updating it now. — Peter
– Peter, Commented Dec 30, 2011 at 13:43

VolkerK · Accepted Answer · 2011-12-30 13:37:52Z

3

You can e.g. pass the core object to the constructor of the forum class and store it as a member.

$forum = new forum($core);


class forum {
  protected $core = null;
  public function __construct(core $core) {
    $this->core = $core;
  }

  public function foo() {
    $this->core->foo('forum');
  }
}

There are other ways to make one object accessible within another, but this is one of the simpler yet feasible solutions.
see https://en.wikipedia.org/wiki/Dependency_injection

answered Dec 30, 2011 at 13:37

VolkerK

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Comments

dotoree · Accepted Answer · 2011-12-30 13:47:12Z

0

You could inject it, look this example

class forum {
    public function hello() {
        return "Hello";
    }
}

class core {
    private $forum;

    public function setForum($forum) {
        $this->forum = $forum;
    }

    public function helloFromForum() {
        echo $this->forum->hello();
    }
}

$f = new forum();
$c = new core();

$c->setForum($f);
$c->helloFromForum();

Similar way if you like frameworks, it's Zend Registry http://framework.zend.com/manual/en/zend.registry.html

edited Dec 30, 2011 at 13:47

answered Dec 30, 2011 at 13:41

dotoree

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